Question

multiple choice questions: choose the correct answer from the choices for each question.

1. which of the following best describes a heterozygous genotype? a) tt

b) tt
c) tt
d) ttt

1. what is the chance of rolling a 3 on a fair six - sided die? a) 1221

b) 1331
c) 1661
d) 1441

1. in biology, what does the term \allele\ mean? a) a type of cell

b) an alternative form of a gene
c) a kind of protein
d) a chromosome

1. what does a punnett square help predict? a) the energy needed for photosynthesis

b) the chance of inheriting certain traits
c) the number of cells in an organism
d) the lifespan of an animal

1. when two parents with genotypes aa and aa are crossed, what is the probability their offspring will have the genotype aa? a) 1441

b) 1221
c) 3443
d) 1111

Explanation:

1. A heterozygous genotype has two different alleles. In this case, Tt has one dominant (T) and one recessive (t) allele.
2. A fair six - sided die has 6 possible outcomes (1, 2, 3, 4, 5, 6). The probability of rolling a 3 is $\frac{1}{6}$.
3. An allele is an alternative form of a gene. For example, for the gene that determines flower color, there could be a 'purple' allele and a 'white' allele.
4. A Punnett square is used in genetics to predict the probability of offspring inheriting certain traits based on the genotypes of the parents.
5. When crossing Aa and Aa:

• The possible gametes from each parent are A and a.
• Using a Punnett square:
• The combinations are AA (25%), Aa (50%), and aa (25%). So the probability of aa is $\frac{1}{4}$.

Answer:

1. B. Tt
2. C. $\frac{1}{6}$
3. B. An alternative form of a gene
4. B. The chance of inheriting certain traits
5. A. $\frac{1}{4}$